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Photos: Barnyard energy

Industrial-size digesters reduce mountains of manure into gas or electricity that can be reused on the farm and/or sold on the open market.
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1 of 10 Bill Detwiler/ZDNet

Thermophilic digester

Five Star Dairy in Elk Mound, Wisc., installed a thermophilic digester about a year ago. Its 900 cows provide enough manure to generate enough power for about 600 homes.

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2 of 10 Bill Detwiler/ZDNet

Lee Jensen

Five Star owner and General Manager Lee Jensen. Five Star sells the biogas produced by the digester to a utility. It will take about 10 years for the revenue from gas sales to pay off the digester, he said, but in the meantime, the farm can cut costs in other ways. The liquids at the end of the process can be used as fertilizer while the solids are comfy cow beds. Neither the liquids nor cow beds smell nearly as bad as the manure did the first time around.

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3 of 10 Bill Detwiler/ZDNet

Aerial view of Five Star

An aerial shot of Five Star. Yes, the digester is a pretty sizeable building to construct.

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4 of 10 Bill Detwiler/ZDNet

Post-digester manure

Farmers check out the post-digester manure. Five Star says that cows actually prefer to sleep on manure over grass and it blows around less than hay.

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5 of 10 Bill Detwiler/ZDNet

Generating biogas at the dairy

Here's a shot of a digester on the Wild Rose Dairy in Wisconsin. This farm sells the biogas generated by the digester to a utility. A large eight-digester project in Texas will produce a billion cubic feet of gas a year when complete.

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6 of 10 Bill Detwiler/ZDNet

Manure digester

Biogas from the manure digester is fed into a generator (the yellow thing), which provides about 700 kilowatts of the electricity required at California's Joseph Gallo Farms, a major cheesemaker. The heat from the generator is then captured and used to run the boiler (the silver thing) that powers the boilers, where cheese is made.

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7 of 10 Bill Detwiler/ZDNet

Seven acres of manure

Guess what's under the tarp? Seven acres of fresh cow manure. Gallo right now has a mesophilic, or ambient temperature, digester. The company, however, is also building a thermophilic one that creates energy by heating manure up to 130 degrees and mixing in the right microbes.

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8 of 10 Bill Detwiler/ZDNet

Manure separator

Manure separator. No, that's not a sun deck up there.

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9 of 10 Bill Detwiler/ZDNet

Thermophilic digester

Moooo! This thermophilic digester at the Five Star Dairy in Wisconsin transforms cow manure and other waste products in 21 days into biogas. The farm doesn't smell nearly as bad after one of these goes in, according to Lee Jensen of the Five Star.

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10 of 10 Bill Detwiler/ZDNet

Five Star Dairy

After the Five Star began to turn manure into gas, it invited farmers from the region to check it out. Because of the costs associated with managing manure, demand is growing.

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